The Nerobergbahn is a funicular railway in the city of Wiesbaden, Germany. The line links the city with the Neroberg hill to its north. From the top of this hill it is possible to view a panorama of the city. The line opened in 1888, and is one of the few remaining funiculars to retain water propulsion. At the upper station, tanks on the downbound car are filled with up to 7,000 litres of water in order to ensure that it is heavier than the upbound car. The downbound car can then pull the upbound car uphill under the power of gravity and by means of a 452 meter long steel cable. When the downbound carriage arrives at the lower station, the water is discharged and pumped back uphill.